For the most part, I don't like South Park. I don't like the fact that the show is a self-indulgent, ham-fisted preachfest that sacrifices story and characters for moral and message, and I don't like the implied smugness of the show's creators. But had you asked my opinion 10 years ago, I would have given you the complete opposite reaction. I loved South Park to the point of obsession, and I still do love the show's old episodes. Matt and Trey knew how to invoke their message properly and with tact, while taking the time to develop a unique and hilarious story to guide the message. South Park: Bigger, Longer & Uncut is the most beautiful, amazing example of this.
Talk about a creative way to get across the message "Censorship is bad": creating a fucking musical! Matt and Trey guide us through the four boys' odyssey to stop their overbearing censorship-obsessed parents from executing Terrance & Philip and save the world from Satan and Saddam Hussein from taking over the world...through song and dance. And let me tell you, the songs in this movie are so damned catchy that they make even the most unforgettable earworm Disney songs sound forgettable in comparison. Out of nowhere, "Mountain Town" or "Kyle's Mom is a Bitch" will just pop into my head and remain there for WEEKS.
SP: BLU is a must-see for...well, anyone who can appreciate hilarious biting satire and disgustingly catchy musical numbers.